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<head>
    <meta charset="UTF-8">
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    <title>数组去重</title>
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<body>
    <script>
        // es5实现
        function unique(arr) {
            var res = arr.filters(function(item, index, array) {
                return array.indexOf(item) === index
            })
            return res
        }
    </script>
</body>

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